摘要
Two-dimensional combustion flame front and temperature profiles of ultra low-calorific gases in porous combustor are investigated numerically.The characteristics of the flame front,high temperature profiles under certain operating parameters,and the flame propagation process are examined.The effects of operating parameters,such as equivalence ratio,superficial velocity of gas and the wall heat loss,on the flame front and high-temperature zone are analyzed.The results show that the shape of the flame front is gradually changed in the propagation process of the flame.Accordingly,this process results in the variation of the high temperature zone.As the equivalence ratio increases,the inclination of the flame front near the wall decreases gradually,while the combustion flame propagates upstream gradually.The shape of the flame front gradually changes from the trapezoid to the straight-line distribution with downward inclination on both sides.The effect of gas velocity on the shape and position of flame front is contrary to that of the equivalence ratio.On the other hand,the wall-heat loss can lead to the inclination of the flame front near the combustor wall,while the effect on the position of flame is less.
Two-dimensional combustion flame front and temperature profiles of ultra low-calorific gases in porous combustor are investigated numerically.The characteristics of the flame front,high temperature profiles under certain operating parameters,and the flame propagation process are examined.The effects of operating parameters,such as equivalence ratio,superficial velocity of gas and the wall heat loss,on the flame front and high-temperature zone are analyzed.The results show that the shape of the flame front is gradually changed in the propagation process of the flame.Accordingly,this process results in the variation of the high temperature zone.As the equivalence ratio increases,the inclination of the flame front near the wall decreases gradually,while the combustion flame propagates upstream gradually.The shape of the flame front gradually changes from the trapezoid to the straight-line distribution with downward inclination on both sides.The effect of gas velocity on the shape and position of flame front is contrary to that of the equivalence ratio.On the other hand,the wall-heat loss can lead to the inclination of the flame front near the combustor wall,while the effect on the position of flame is less.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2012年第6期1893-1901,共9页
CIESC Journal
基金
supported by the Natural Science Foundation of Zhejiang Province(Y1090313)
the National Natural Science Foundation of China(51006029)~~
关键词
泡沫陶瓷
多孔介质燃烧
火焰峰面
倾斜
foam ceramics
porous medium combustion
flame front
inclination